774504
Description
Mind Map by samantha_x, updated more than 1 year ago
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Created by samantha_x
about 10 years ago
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Capacity STM, LTM
- capacity refers to how much can be held
in a particular place
- Capacity of STM
- digit span technique - Jacobs 1887
- used the technitque to assess capacity of STM - found that ave span for digits =
9.3 items and 7.3 for letters - suggests this is because there's only 9 letters and
26 letters
- used the technitque to assess capacity of STM - found that ave span for digits =
9.3 items and 7.3 for letters - suggests this is because there's only 9 letters and
26 letters
- Baddeley et al 1975
- if people could remember more short words than long words in a recall
test and so demonstrate that pronounciation time, rather than the
number of items to be recalled, determines the capacity of STM
- reading speed was measuresd - participants given 5 words on screen
- words taken from one-syllable and polysyllablic words - participants asked to write down
5 words in order immediately after - recalled long and short words
- could recall more short than long words
- could recall more short than long words
- words taken from one-syllable and polysyllablic words - participants asked to write down
5 words in order immediately after - recalled long and short words
- reading speed was measuresd - participants given 5 words on screen
- if people could remember more short words than long words in a recall
test and so demonstrate that pronounciation time, rather than the
number of items to be recalled, determines the capacity of STM
- digit span technique - Jacobs 1887
- Increasing capacity of STM
- Miller 1956 - the magic number 7 plus or minus 2
- he reviewed psychological research and concluded that the span of immediate memory is 7; people can cope well with
counting 7 dots flashed onto a screen but not many more than this
- He also found that people can recall 5 words as well as they can recall 5 letters - we chunk things together and then can remember more
- He also found that people can recall 5 words as well as they can recall 5 letters - we chunk things together and then can remember more
- he reviewed psychological research and concluded that the span of immediate memory is 7; people can cope well with
counting 7 dots flashed onto a screen but not many more than this
- Miller 1956 - the magic number 7 plus or minus 2
- Evaluation
- Jacob
- individual differences: the digit span not the same for everyone - increased with age - 8
year olds could remember an average of 6.6 digits whereas the mean for a 19 year old = 8.6
digits
- individual differences: the digit span not the same for everyone - increased with age - 8
year olds could remember an average of 6.6 digits whereas the mean for a 19 year old = 8.6
digits
- Capacity of STM may be more limited
- Cowan 2001 - reviewed a variety of studies on the capacity of STM and
concluded that STM is likely to be limited to about 4 chunks. Suggests
that STM may not be as extensive as first though
- some researchers looked at capacity of STM for visual
information and found that 4 items was about the limit
(VOGEL ET AL 2001)
- Cowan 2001 - reviewed a variety of studies on the capacity of STM and
concluded that STM is likely to be limited to about 4 chunks. Suggests
that STM may not be as extensive as first though
- Jacob
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